Oeeejt allen



D. ALLEN; BXBANSIBLE DRILL.

Nag 294,302. Patented Feb .f26,*1884.

N. PETERS, Pnnlo-ullwgnpmr. washington, n. C.

j operation.

. `Ummm-3i) vSTATES ORREN ALLEN, or DENVER, COLORADO.

EXPANSIBLE DRILL. j

SPECIFICATION forming part of Letters Patent 116,294,302, date-a February 2e, 1884..

Application filed January Q8, 1884. (No model.) j

To all whom it may concern Be it known that I, ORREN ALLEN, a citizen of the United States, residing at Denver, in the county of Arapahoe and State of Colorado, have invented certain new and useful Improvements in Expansible Drills, of which the following is a specication, reference being had therein to the accompanying drawings.

My invention relates to improvements in expansible drills, in which the 'cutting partis made separable and adjustable; and the Objects of my improvements are to provide a drilling-tool that can be compressedsufflciently to be lowered into wells through the casing,

and expanded sufficiently below the ter-minus of the casing to drill the well the same size of that containing the casing, which enablesoperators to bore wells a uniform size through any material that is capable of being penetrated by drills to any desired depth.v These obj ects I attain by means of the device illustrated by the accompanying drawings, forming part of this specification, in which- Figure l is a perspective view of the drill, Fig. 2, a side and part sectional view, showing the tool expanded, asin use; Fig. 3, a side and part sectional view compressed, showing the tool in the position assumed while being raised or lowered through the casing.

Similar letters and iigures refer to similar parts throughout the several views.

A in the drawings represents the main stem of the drill, having grooves a c therein, and having the guard B attached thereto. rI'he lower extremity of the stem A is pointed, as shown in the drawings at b.

In the grooves a a, and within the guard B, are placed supplemental drillsD D, having the projections d d thereon, which prevent the supplemental drills dropping below the position shown in Fig. 3, being the position assumed during the process of raising and lowering the tool thr'ough the casing. rIhe upper ends of the supplemental drills have notches C maden therein, which receive the catches E,.

which serve the purpose of retaining the drills D D in the position shown in Fig. 2 while in The catches E are pivoted in the grooves a a by means of the bolts f.

To the upper ends of the catches E are Aatcontact with the notches C C of the drills D D.

In the use of myinvention, the drill, arranged as shown in'Fig. 3, is in position to be lowered into the well through the casing, which may extend down within Aa few feet of the bottom of the bore. When the supplemental drills reach the bottom of the hole, they spread apart at their lower ends, which allows the part b of the main stem A to enter between the drills D D, forming a drilling-surface the same width of that `part of the well containing the casing. (See Fig. 2.) The catches E engage with the notches C, which retains the supplemental drills D D permanently in that positionwhile the operation of drilling is being carried on, lWhen it becomes necessary to raise the drill out of the well, the drill is raised upward by any suitable means. When the upper ends of the parts" E come in contact with the inner circumference of the casing, they are compressed inward, as shown in Fig. 3, which carries outward the catches, releasing the supplemental drills D D, which allows them to drop downward into the vposition shown in Fig. '3, and which admitsof their closing together in such a manner as tobe drawn upward through the casing with ease. By this means theimpossibility heretofore experienced in continuing wells a uniform size through alternatestrata of rock and quicksand or mud is entirely overcome.

Having thus fully described the construction and use of my invention, what I claim as new,

and desire to secure by Letters Patent, is`

l.` The hereinbefore described expansible drill, consisting, substantially, of the stem A, having grooves a a made therein, and the guard B, affixed thereto, as set forth, the supplemental drills D D, having extensions d d thereon, and provided with notches C, the catches E, and spring F, all operating as described and specied, and for the purpose set forth.

2. The stem A, having grooves a aytherein, and guard B, `attached thereto, as specified.

3. rIhe supplemental drills D D, pointed at their lower extremities, and provided with i notches C.

IOO

7. In an'expansible drill, a stem forming a 15 drill, supplemental drills by which the cutting-surface is increased,suitable means of retaining the drills in position to penetrate rock or other materials, and suitable means of retaining the drill -in position to be raised and 2o lowered through the casing, as described and specified.

In testimony. whereof I affix my si gnature in presence of two witnesses.

ORREN ALLEN. l

Vitiiesses:

FRANK Q. STUART, Gno. W. ALLEN. 

